assets, and flatt tells cnbc there continues to be a lot of investment opportunity in america. flatt says he's bullish on the u.s. because housing, retail and manufacturing are all making a comeback, and he sees possibilities in the shale gas revolution. flatt also mentioned he's looking for value plays in europe and emerging markets. it's always fascinating to know how billionaires are investing *their money. insider monkey reveals warren buffett and others are buying shares of davita. the company owns kidney dialysis centers. billionairs are also bullish on sirius satellite radio company verisign. another popular stock with 1-percenters is an internet registry services company. and billionairs are also big on credit card stock visa. investors are keeping their eyes on priceline. the stock is closing in on a milestone: $1,000 a share. in its latest earnings, priceline notes "tremendous momentum" going forward. strength in europe helped revenues. noodles and company, which went public earlier this summer, is trading lower after its first set of earnings failed to increase inves